He was unpublished in his lifetime, but left papers on longitude and the moons of Jupiter that were published posthumously. He also wrote at the Royal Society's request a set of directions for sailors, on the correct way to record meteorological and oceanographic observations on their travels. These appeared in volume 1 of the Royal Society's Philosophical Transactions as Directions for Sea-men, bound for far Voyages (Phil. Trans. 1665 1 140-143) doi:10.1098/rstl.1665.0066.[6]